A large number of students in our school ____ from the countryside; the number _____ growing these years.

 Scientists think that the continents ____ always where they ___today.

—— Bob has gone to California.—— Oh, can you tell me when he _____?

—Do you know the most ancient city in China—Xi’an well?—No，this is the first time I ________ here. 

－What did you do yesterday evening, Gina?－I ________ Titanic 3D in the City Cinema.